fixes vendor selection bug

e2e/transaction-edit.spec.ts

@@ -455,6 +455,93 @@ test.describe('Transaction Edit Vendor Pre-population', () => {
   });
 });
 
+// Drives the *real* vendor typeahead the way a user does: open the dropdown,
+// click a rendered result. The vendor search is backed by Solr (unavailable in
+// tests), so the result option is injected into the typeahead's Alpine
+// `elements` instead of being fetched. Everything else -- the dropdown's own
+// search input firing a native `change` on blur, the `value = element` click
+// handler, the Alpine reactivity, and the HTMX round-trip to
+// `edit-vendor-changed` -- runs exactly as in production. This is the flow that
+// regressed: a stale native `change` from the search input used to win the race
+// and revert the vendor to its previous value.
+async function selectVendorViaDropdown(page: any, vendorId: number, vendorName: string) {
+  const wrapper = page.locator('div[hx-post*="edit-vendor-changed"]').first();
+  const typeahead = wrapper.locator('div.relative[x-data]').first();
+
+  // Open the dropdown (tippy renders the popper into [data-tippy-root]).
+  await typeahead.locator('a[x-ref="input"]').click();
+
+  const search = page.locator('[data-tippy-root] input[x-model="search"]').first();
+  await search.waitFor({ state: 'visible' });
+
+  // Type under the 3-char search threshold so no Solr request fires and clears
+  // our injected option, while still dirtying the input so it fires a native
+  // `change` on blur -- the event that used to clobber the selection.
+  await search.fill('te');
+
+  // Inject a clickable result into the typeahead's Alpine state.
+  await typeahead.evaluate(
+    (el: HTMLElement, opt: { id: number; label: string }) => {
+      (window as any).Alpine.$data(el).elements = [{ value: opt.id, label: opt.label }];
+    },
+    { id: vendorId, label: vendorName }
+  );
+
+  // Click the rendered option: fires the search input's native change (stale
+  // value) AND the synthetic change carrying the new value, then HTMX swaps.
+  await page.locator('[data-tippy-root] a', { hasText: vendorName }).first().click();
+
+  await page.waitForResponse(
+    (response: any) =>
+      response.url().includes('/edit-vendor-changed') && response.status() === 200
+  );
+  await page.waitForTimeout(500);
+}
+
+// Opens the edit modal and activates the Manual tab, waiting on the vendor
+// typeahead rather than the account grid (which only exists in advanced mode).
+async function openManualVendorSection(page: any, transactionIndex: number) {
+  await page.goto('/transaction2');
+  await page.waitForSelector('table tbody tr');
+
+  const editButton = page
+    .locator('button[hx-get*="/transaction2/"][hx-get*="/edit"]')
+    .nth(transactionIndex);
+  await editButton.click();
+
+  await page.waitForSelector('#modal-holder[x-show="open"]', { state: 'visible' });
+  await page.waitForSelector('#wizardmodal');
+  await page.click('button:has-text("Manual")');
+  await page.waitForSelector('div[hx-post*="edit-vendor-changed"]');
+}
+
+test.describe('Transaction Edit Vendor Selection', () => {
+  test('selecting a vendor from the dropdown updates the displayed vendor', async ({ page }) => {
+    await openManualVendorSection(page, 3);
+
+    const testInfo = await getTestInfo(page);
+    const vendorId: number = testInfo.accounts.vendor;
+
+    await selectVendorViaDropdown(page, vendorId, 'Test Vendor');
+
+    // The displayed vendor label must reflect the selection after the HTMX
+    // round-trip. Before the fix this reverted to blank because a stale
+    // `change` event submitted the previous vendor and its response won.
+    const label = page
+      .locator('div[hx-post*="edit-vendor-changed"] span[x-text="value.label"]')
+      .first();
+    await expect(label).toHaveText('Test Vendor');
+
+    // The server-rendered hidden input must carry the newly selected vendor id.
+    const hidden = page
+      .locator(
+        'div[hx-post*="edit-vendor-changed"] input[type="hidden"][name="step-params[transaction/vendor]"]'
+      )
+      .first();
+    await expect(hidden).toHaveValue(vendorId.toString());
+  });
+});
+
 test.describe('Transaction Link Date Display', () => {
   test('should show payment date when linking to payment', async ({ page }) => {
     await openEditModalForTransaction(page, 'Transaction for payment link');